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Stockholders' Equity (Repurchases of Common Stock Under Share Repurchase Programs) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Equity, Class of Treasury Stock [Line Items] | |||
| Stock repurchased to satisfy tax withholding obligations, Mone | $ 37 | $ 36 | $ 46 |
| Stock repurchased to satisfy tax withholding obligations, Shares | 0.7 | 0.7 | 0.8 |
| Total stock repurchases, Monetary | 862 | 1,286 | 1,496 |
| Total stock repurchases, Shares | 16.6 | 27.8 | 29.8 |
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Share Repurchase Program [Member]
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| Equity, Class of Treasury Stock [Line Items] | |||
| Stock repurchased under our stock repurchase programs, Monetary | $ 825 | $ 1,250 | $ 1,450 |
| Stock repurchased under our stock repurchase programs, Shares | 15.9 | 27.1 | 29.0 |